Share 'Making zine spaces accessible'

Recently, there have been a number of zine fests that have not been wheelchair accessible, including the NYC Zinefest, and Canzine. I also believe Expozine was held at an inaccessible spot.
What gives? What can we, as a zine community, do to make sure this doesn't happen? I know that the inaccessibility of these spaces is not even acknowledged beforehand, so people arrived at the NY Zinefest un…